Depends on what you're doing... WW1, WW2, Korea? Vietnam, Modern? Male, Female? Fighter or bomber/transport? Leather, hard-hat, cap? US, RAF, Soviet, Luftwaffe, Japanese? Army? Navy? Civilian? Fixed-wing? Helicopter?
The numbers are rather limited, but there's plenty of kits that include seated pilots (although not as many as you'd think) and most can be converted as well...